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Hypthesis Testing: Independent sample t test

Markowitz and Felson (1998) examined how attitudes toward violence may differ between the general population and ex-offenders. This question is based on their paper. The authors asked both samples to indicate whether they strongly agreed (-2), agreed (-1), were not sure (0), disagreed (+1), or strongly disagreed (+2) with the following statement: 'An eye for an eye, a tooth for a tooth is a good rule for living'. The mean response in the sample of the general population (n = 15) was 0.886 (standard deviation = 1.034). The mean response in the sample of ex-offenders (n = 21) was 0.177 (standard deviation = 1.261).

Perform a hypothesis test to determine if there is a difference in the mean response. Use a 0.10 level of statistical significance and assume that population variances are equal.

Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.